Transmission/Gear shift problem

My 1998 Cadillac Catera did not pass the emmission test. It is having gear shift problem. It doesn't want to go past 25, 30 mph. Besides the transmission rebuilt, what else do I need to do while the transmission is out. I need to get the radiator replaced and I will get the thermostat replace. I am also going to have the pressure checked to make sure that I do not have a blown head gasket. Is there any thing else that I should get replaced while the transmission and possibly engine is out? Nancy.

Could use some advice from you guys on my 1998 Catera. Last week while taking a 45 min drive I noticed the transmission was shifting a little erratically and it seemed to be switching randomly betwee...

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